<template>
  <div class="com-container"  @dblclick="revertMap">
    <div class="com-chart" ref="map_ref"></div>
  </div>
</template>

<script>
import axios from "axios";
import { mapState } from 'vuex'
import { getProvinceMapInfo } from '../utils/map_utils'
export default {
  name: "Map",
  data() {
    return {
      chartInstance: null,
      allData: null,
       mapData: {} // 所获取的省份的地图矢量数据
    };
  },
  created () {
    // 在组件创建完成之后 进行回调函数的注册
    this.$socket.registerCallBack('mapData', this.getData)
  },
  mounted() {
    this.initChart();
    //this.getData();
     this.$socket.send({
      action: 'getData',
      socketType: 'mapData',
      chartName: 'map',
      value: '',
    })
    window.addEventListener("resize", this.screenAdapter);
    //屏幕自适配
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
     this.$socket.unRegisterCallBack('mapData')
  },
  methods: {
    async initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.map_ref, this.theme);
      // 获取中国地图的矢量数据
      // http://localhost:8999/static/map/china.json
      // 由于我们现在获取的地图矢量数据并不是位于KOA2的后台, 所以咱们不能使用this.$http
      const ret = await axios.get(
        "http://localhost:8999/static/map/china.json"
      );
      this.$echarts.registerMap("china", ret.data);
      //对图表初始化配置的控制
      const initOption = {
        title: {
          text: "▎ 商家分布",
          left: 20,
          top: 20,
        },
        geo: {
          type: "map",
          map: "china",
          top: "5%",
          bottom: "5%",
          itemStyle: {
            areaColor: "#2E72BF",
            borderColor: "#333",
          },
        },
        legend: {
          left: "5%",
          bottom: "5%",
          orient: "vertical",
        },
      };
      this.chartInstance.setOption(initOption);
            this.chartInstance.on('click', async arg => {
        // arg.name 得到所点击的省份, 这个省份他是中文
        const provinceInfo = getProvinceMapInfo(arg.name)
        console.log(provinceInfo)
        // 需要获取这个省份的地图矢量数据
        // 判断当前所点击的这个省份的地图矢量数据在mapData中是否存在
        if (!this.mapData[provinceInfo.key]) {
          const ret = await axios.get('http://localhost:8999' + provinceInfo.path)
          this.mapData[provinceInfo.key] = ret.data
          this.$echarts.registerMap(provinceInfo.key, ret.data)
        }
        const changeOption = {
          geo: {
            map: provinceInfo.key
          }
        }
        this.chartInstance.setOption(changeOption)
      })
    },
     getData(ret) {
     // const { data: ret } = await this.$http.get("map");
      this.allData = ret;
      this.updateChart();
    },
    updateChart() {
      // 图例的数据
      const legendArr = this.allData.map((item) => {
        return item.name;
      });
      const seriesArr = this.allData.map((item) => {
        // return的这个对象就代表的是一个类别下的所有散点数据
        // 如果想在地图中显示散点的数据, 我们需要给散点的图表增加一个配置, coordinateSystem:geo
        return {
          type: "effectScatter",
          rippleEffect: {
            scale: 5,
            brushType: "stroke",
          },
          name: item.name,
          data: item.children,
          coordinateSystem: "geo",
        };
      });
      const dataOption = {
        legend: {
          data: legendArr,
        },
        series: seriesArr,
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = (this.$refs.map_ref.offsetWidth / 100) * 3.6;
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        legend: {
          itemWidth: titleFontSize / 2,
          itemHeight: titleFontSize / 2,
          itemGap: titleFontSize / 2,
          textStyle: {
            fontSize: titleFontSize / 2,
          },
        },
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
        // 回到中国地图
    revertMap () {
      const revertOption = {
        geo: {
          map: 'china'
        }
      }
      this.chartInstance.setOption(revertOption)
    }
  },
      computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme () {
      console.log('主题切换了')
      this.chartInstance.dispose() // 销毁当前的图表
      this.initChart() // 重新以最新的主题名称初始化图表对象
      this.screenAdapter() // 完成屏幕的适配
      this.updateChart() // 更新图表的展示
    }
  }
};
</script>

<style scoped>
</style>